Question

The number of $\pi -$bonds present in the monomer of polyacrylonitrile is:

• A. $2$
• B. $1$
• C. $3$
• D. $4$

Answer 1

Answer: (C)

$3$

Polyacrylonitrile is obtained from a monomer, acrylonitrile having structure as $C{H}_2=CH-CN$.
Cyano group contains two $\pi$-bonds and a $\sigma$-bond.
A double bond is present between two carbon atoms.
Thus, three $\pi -$ bonds are present in the monomer.